From 776bac64bf13e20c27f7ad168811abdf3b72f14d Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Thu, 27 Jul 2017 19:13:36 +0200
Subject: [PATCH] ASoC: samsung: Fix possible double iounmap on s3c24xx driver probe failure
Git-commit: 776bac64bf13e20c27f7ad168811abdf3b72f14d
Patch-mainline: v4.14-rc1
References: bsc#1051510

Commit 87b132bc0315 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use
generic dmaengine API") moved ioremap() call from
s3c-i2s-v2.c:s3c_i2sv2_probe() to s3c2412-i2s.c:s3c2412_iis_dev_probe()
and converted it to devm- resource managed interface.

However the error path in first of them - s3c_i2sv2_probe() - was not
updated.  If getting a iis clock in s3c_i2sv2_probe() failed, the
address space would be unmapped there.  This could lead to:
1. double iounmap() later from devm-interface of s3c2412_iis_dev_probe()),
2. accessing the memory by other functions in s3c2412-i2s.c unit.

Anyway, the owner of this mapped region should be s3c2412-i2s.c because
it starts the mapping.

Affected are drivers for S3C24xx family although issue was not reproduced.

Fixes: 87b132bc0315 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use generic dmaengine API")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Arvind Yadav<arvind.yadav.cs@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/samsung/s3c-i2s-v2.c |    1 -
 1 file changed, 1 deletion(-)

--- a/sound/soc/samsung/s3c-i2s-v2.c
+++ b/sound/soc/samsung/s3c-i2s-v2.c
@@ -634,7 +634,6 @@ int s3c_i2sv2_probe(struct snd_soc_dai *
 	i2s->iis_pclk = clk_get(dev, "iis");
 	if (IS_ERR(i2s->iis_pclk)) {
 		dev_err(dev, "failed to get iis_clock\n");
-		iounmap(i2s->regs);
 		return -ENOENT;
 	}